I'm thinking of buying a GHD after the great reviews. But there are a few to choose from. There's a Ghd Ministyler with smaller plates, GHD prof. styler wich straightens your hair with " total styling control " (?) & last one with wider plates. Don't know wich one i should buy I have dry and wavy hair wich is not easy to straighten. Has anyone tried GHD Iron Oil & can tell me if it's any good ?